<template>
  <div>
    <city-header></city-header>
    <city-search :cities="cities"></city-search>
    <city-list :letter="letter" :cities="cities" :hot="hotCities"></city-list>
    <city-alphabet :cities="cities" @change="handleLetterChange"></city-alphabet>
  </div>
</template>

<script>
  import axios from 'axios'
  import CityHeader from './components/Header'
  import CitySearch from './components/Search'
  import CityList from './components/List'
  import CityAlphabet from './components/Alphabet'
  export default {
    name: 'City',
    mounted () {
      this.getCityInfo()
    },
    data () {
      return {
        cities: {},
        hotCities: [],
        letter: ''
      }
    },
    methods: {
      getCityInfo () {
        axios.get('/api/city.json').then(this.handleGetCityInfoSucc)
      },
      handleGetCityInfoSucc (res) {
        res = res.data
        if (res.ret && res.data){
          const data = res.data
          this.cities = data.cities
          this.hotCities = data.hotCities
        }
      },
      handleLetterChange (letter) {
        //通过emit触发函数接收子组件传递给父组件的内容
        this.letter = letter
      }
    },
    components: {
      CityHeader,
      CitySearch,
      CityList,
      CityAlphabet
    }
  }
</script>

<style lang="stylus" scoped>

</style>
